Self-centering ring chuck



March 10, 1925. 1,529,327

A. s. THOMPSON SELF CENTERING RING CHUCK Filed July 5, 1924 1 lil m M I U f,

, gmwrw m an awomwu Patented Mar. 10, 1925.

ARTHUR S. THOMPSON, OF ONTARIO, CALIFORNIA.

SELF-CENTERING RING- CHUCK.

Application filed July 3,"

To all whom it may concern:

Be it known that I, ARTHUR S. THOMP- SON, a resident of Ontario, in the county of San Bernardino and State of California, a citizen of the United States, have invented certain new and useful Improvements in Self-Centering Ring Chucks, of which thefollowing is a specification.

My invention relates to improvements in self-centering ring chucks, the main object being the provision of a chuck or device which will locate or center the ring with absolute accuracy in a cement mass, which upon hardening will retain the ring in place and permit the placing in a lathe where the bezel or seat for the precious stone may be made in an absolutely perfect manner.

Another object of my invention is the provision of a chuck in which the centering of the ring for the purpose of boring the seat or bezel may be made, which will perform its functions in a rapid and accurate manner and will prove highly desirable and useful for the purpose intended.

Another object of my invention is the provision of a ring chuck of the character and for the purpose stated which will be of small and compact construction, which will be simple, durable and inexpensive and which generally in every respect will be practical and eflicient.

To attain the desired objects, my invention consists of a self-centering ring chuck embodying novel features of construction, combination and arrangements of parts, substantially as described and defined by the claims, and as shown in the accompanying drawings, wherein Figure 1 represents a side elevation of a ring chuck constructed in accordance with and embodying my invention.

Fig. 2 represents a vertical central sectional view of the chuck, with the ring shown in the mass or bed of cement and the parts in operative position.

Fig. 3 represents a vertical central sectional view of the chuck with the parts separated or before being fitted together for operation.

Fig. 4 represents a view on the line 4-4 of Fig. 3, and

Fig. 5 represents a detail view of the ring receiving and supporting member, and

Fig. 6 represents a modified form of the ring supporting member.

Referring by letter to the drawings in 1924. Serial No. 724,091.

which the same letters of reference are used to indicate like parts in all the views.

The letter A designates the lower or cup member of my chuck, which is adapted to receive when in use the cement mass B, and is formed with the annular recess O,and with the threaded opening D, to receive the threaded portion -E, of the stem F, which is used in connection with the lathe for retaining the cup member in place.

Fitting within the annular recess C, is the lower open portion of the cap G, which is provided with the central depending boss H, formed with an opening J, and with the pair of openings K, and to said cap is secured the open frame member L, which is provided with openings M in line with said openings K, and with a central opening M in line with said opening J of the boss H, while the upper portion of said open frame is provided with the pair ofopenings N and the central opening N, the said openings of the cap and frame thus being in line and the. (entral opening receiving and guiding the pin 0 formed with the centering point 0 and having its reduced upper stem 0 passing through the opening N of the open frame, and being threaded at O to receive the adjusting nut 0 said pin being normally forced down by the action of the coil spring P.

From this construction it will be noted that the centering pin with its point is adjustable in the cap and frame and is retained in proper adjustment by means of the coil spring P, and in operation the point 0', is guided by the plate Q and engages the depression or socket R in the ring S, which ring rests in the cement bed B upon the supporting member T, which at its ends receives the pair of threaded sleeves U, said threaded sleeves receiving the lower threaded ends V of the pair of adjusting rods V, which have at their upper ends the heads or knobs V for adjusting the ring supporting member in the bed of cement, as will be readily understood from the drawing when. taken in connection with the description.

In operation the cup member is filled with a suitable cementitious material and in its soft or plastic condition the ring supporting member is seated'in said material, the parts are then connected and the centering point adjusted, as shown in Fig. 2, to perfectly center the ring. Upon accurately centering the ring and the hardening of the cement, ithe pa rts of the. chuck are disconnected} as shown in Fig. 3,;whe11 th'enlower cup member is fitted to the lathe, which en uself-centering ring chuck will be instantly "understood and appreciated by all persons skilled in-such devices, and it will .benoted that my chuck is the embodiment of :simv plicity and inexpensiveness ofconstruction;

jrthata it will with absolute-certainty place or center the ringinproper position for the drillmg. or borlngofthe bezel orzseat; and

.1 that generally the chuck embodies the essen- 1 tials 'to :insure a practical and highly de- .sirable device for'the purpose intended.

The cap' Grv is preferably provided with a peep .hole G', to.ena-ble vision from the outside of the ring, and the supporting -.member T, may be: provided as shown 1n Figure 6, with an'opening T, topermit en- ;tranceof the point, or to receive the cement to: anchor the member.

I claim:

1. Aself-centering ring chuck, .consistlng .of a cup or mold member, a ring supporting -mem'berradapted to be disposedin said mold member, a ,cap. member-adapted, to the connected. to ,said tmolda member? and ring-supporting member, and adjusting and ringcentering means mounted in said cap member.

2. A selfrcentering ring chuck, consisting of a cup or mold member, a ring supporting member adapted'to be disposed in said mold member, a cap member adapted to be connected to said mold member and ring-supporting member, and ring-centeringand adj u-sting means mounted invsaid cap. member, and consisting-of a centrally disposed radjustable spring-actuatedcentering pin, and adjustable connections betweenthe ring sup porting memberand cap member.

3. A self-centeringring chuck, consisting of a cup or moldmember, aringsupporting member adapted to The supported in .a. cemen bed in said mold member, apair ,of sleeves carried by said ring-supporting;member, a

cap men'ibeiu-aclaptecltov be ,fittedtosaid w mold member, a -pairflo-f adjusting ste ms mounted in said cap .member. .with their lower ends adjustable insaid pair of sleeves, and a ring centering pin carried by. said cap member, having a threaded adjustable stem, and a coil spring around said stem for normally forcing. said centering p-in down-ward. I

In testimony ,whereof Iv hereunto 'afiiX my signature. 1

ARTHUR, S. THOMPSON 

